US Patent 10520091 Double direction seal with locking

Lip type rotary seal assemblies are generally discussed herein and particularly those with double directional sealing, wherein the tip of the two sealing lips point in opposite directions. A locking ring is incorporated to retain the seal assembly in the housing. The seal is configure to provide different sealing forces at each end to provide flexibility and enhanced performance where two different conditions on each side of the seal can exist, such as different sealing medium, fluid viscosity, pressure, and rotary speed.